Packer for centrifugal pumps



Nov. 10, 11931. w, J, MMMMMM HUR y 1,831,571

E FUGAL PU'IP S Filed June 24. 1927 I //VVENOP Patei1tecl Nov. 10, 19311 UNITED STATES PATENT- OFFICE 'WILIIIAI IACABTHU'B, O! LOS ANGELES,CALIFORNIA, .ASSIGNOR 01? GITE-BALI IO BEA E, MAYN'ARD, 01 LOS ANGELES,CALIFORNIA r.ecmm ron CENTRIIF'U'GAL murs Applicatlon flled June 24,

This invention relates to means for packing the drive shaft ofcentrifugal or rotary pumps in such manner as to avoid leakage into orout of the pump case vythout having 6 recourse to ackng materiale of aflexible or compressi le nature. v

It is an object of this invention to provide a. packer of metallic orother essentially rigid material, this packer having 'an opening 10formed therethrough through which the pump shaft extends and beingbrought to an accurate sliding fit with the shaft, depending entirelyupon this fit to prevent leakage around the shaft.j

It is another object of this invention to provide a rigid packer of thischarac ter which is situated in a cevity or box olosed at its outer oend by a gland; the packer havin un accurately ground fadal face which1s aclapted to eng'a e un accurately ground radial fece of the g end inorder to prevent a radial lealtage past the rigid packer. 4

It is a further object' of this invention to provide a. rigid packer ofthis character in which the radialface of the'packer is held inpressural contact with the radial fece of the gland by sprin so situatedas to thrust the two radial faos into, contact.

Itjs a still frther object of this invention to provide a d packer ofthis character Wh1ch is radial y adjustable and may thus conform to anysidewise movement of tbe pum shait.

Ot er objects and advantages of this inventon will be made evidenthereinafter.

Referrin to the drawings in which I illustrate e pre erred-embodiment ofmy invention Figure 1 is a sectional view through a packer of myinvention showing the packer mounted on the shaft and ietaifled by thegland Figure 2 is a sect1on taken on the line 2-'-2 of F1gure 1 Figure 31s a. secti on takei1 on the li'ne 33 of Figure 1.

With reference particularly to Figure 1 of the drawings 1 is the shaftwhich drives the impeller of tbe pump and which is in rotation when thepump is operating. 2 is that 1927. Serial No. 201,172.

held in place and adjusted in po sition by the swing bolts 6 and thedraw nuts 7, the

6 swmgng on the pins 8 which are Ii1iil'" fast to the pump casing bodyby anyionvement means net shown.

The gland 4 has turned in its i1mer face a groove 9 forthe retention ofa ring of fiexible packmg 10, which ring mey preferably be formed ofone-quarter inch square hydrauho packing. This ring is drawn against thefece 11 of the pump body, which face should al: the polnt ofengagement;oiihe packing r1ng be turned smooth and squarwith the ax1s ofthe pump shaft 1.

The inner face of the projectiofl 5 of the 1 gland 4 is acurately groundto a. suitable radius, which may be about twice the dameter of the pumpshaft 1, this radial face being ndicated at 12. The floatng nng 13 maybe" made of brass or other suitable metal and is arcuartely ground atits outer end to fit the correspondmg arcuately ground 'inner face ofthe projection 5. This ring 13 should be greater in inside diameter 1hanthe outside diameter of the pump shaft and should bo less in outsidediameter than the inside diameter of the chamber 3, so that it will befree to move radially .as reluted to the pdsition of the pump shaft. Theinner fece 14 of the ring 13 should be' round smooth and in a.

plane'at an exact r1ght angle to the axis 01" the ring.

The pcker 15 may be formed ofmetal or.

of other suitable rig1d material, such as will be herenafter described.-Its inner face 16 should. be a dose sliding fit over the shaft, a

clea'rance of approximately one one-tho sandth of an inch bngrecommended es a suitable clearance. The tightness of the packer againstleakage depends on the forniing of a perfectfit at this point and careshould be taken that the two surfaces be S0 accnrately fitted that theywill neither leak nor bind. The enter face 17 of the paeker should be aloos fit in the chamber 3, a clearance of two or three one-hundredths ofan inch being recommended as a suitable olearance. The end face 14 ofthis packer sbould be very carefully ground to fit'the end faee 14 ofthe ring 13, this ground face being a piane at right angles to the axisof the packe1.

On the opposite end of the packer a suitable number of sockets orshallow holes are drilied as indicated at 18. A ring 19 is placed in thebottom of the chamber, resting on the projection 20, and to this ring 19are aiiixed a number of pins 21 correspondin in number and positionwiththe holes 18. Ihe pins should be enough smaller than the holes toallow room for the open coil spring 22, one of which springs is lacedaround each pin 21 and insde each ole 18. The purpose of these springsis to hold the faces 14 of the packer and the floating rin and the faces12 of the floating ring and 13 e gland in nonleaking contact. Thepurpose of the pins is to protect the springs against distortion orcramping in case the packer 15 should at any time tend to revolve withthe shaft and move from its fixed position in relation to the ring 19.Where the clearance between the shaft and the chamber is small, acircumferential coil spring may be used in place of this assembly ofsprings end pins.

It is desirable, though not essential, to form in the inner surface ofthe packer 15 the tbree grooves indicated at 23, 24 and 25, and to bringthe central groove 24 into eommunication with a small channel 26 drilled 10mitudinally through the acker towards 1ts enter fece 14 Wherethedrill hole communicates With a simiiar groove 27 formed in the endface 14 of the packer. This last named groove in turn communicates witha narrow hole 28 drilled longitudinally through the metal of thefloating ring 13, this dri1l hole eommunicating with a groove 29 formedin the face 12 of the floating ring. This groove 29 in turn communicatesthrough the drill holes 30 with a one-quarter inch pipe tu 36 formed inthe body of the gland 4, W ich tapped hole may be connected to thedischarge of the pump by a pipe connection net shown. The purpose ofthese channels is to seal the packer against possible suction leaks Withwhatever liquid is being pu'mped. The provision of these grooves-andehannels is desirable but not requisite.

The gland 4 should be bored out to such. diameter that it will notcontact With the shaft 1, a clearance of two or three one-hundredths ofan inch being recommended as a suitable clearance at the points 32 and33. Intermediate these two points, as at the point 34, the gland maydesirably be hollowed out to form a chamber communicating with the pipetap 31 which may drain to the open air or into a suitable receptaole forthe purpose of coilcting any small leakage and preventing it fromreaching the floor 01' pump base. This tap 31 should be so spotted inthe gland as to look downward when assembled.

'Ihe inner end of the chamber 3 being in communication With the liquidin the body of the pump, the chamber 3 will be filledwith liqu1d.Leakage between the packer 15 and the shaftl will be prevented by theclose fit of the packer on the shaft. Leaka e from the chamber 3 intothe annular space etween the gland 4, the floating rin 13 and the pumpshaft 1 will be prevented %Jy the close contact of the ground faces 14and 12. Leakage from the 0 amber'3 into the space between the gland 4and the pump body 2 Will be prevented by the ring of flexible packing 10interposed betWeen the gland and the surfaced face of the pump body.

Inasmuch as the retention of fluid depends in the first instance on thecloseness of the fit betWeen the packer 15 and the shaft 1, the packercannot desirably be made too short in relation to its diameter. A iengthfor the packer 15 net substantiallj less than it's internal diameter isessential and it is recommended that where construction conditionspermit, the length of tbis.packer be made approximately one and one-halftimes its internal diameter.

The materials from which the various parts of this device may suitablybe constructed is known to these skilled in the art. The pump case Willin almost ali cases be of cast iron and the gland may be of cast iron orsteel as preferred. In any case it is desirable, though net necessary,to bere out the inner face of the gland as indicated at 35 and to pressfirmly into this bore a ring of brass or bronze on which ring the radialface 12 would be formed, this for the pur ose of preventing theformation of rust on t e sensitive ground face. For the same reasonit isdesirable to make the floating ring 13 of a nonrusting metal. The packer15 should be of some material which Will not out the shaft. If the shaftis of mild steel a ferrous metal packer is not desirable, though eithercast iron or steel may be used for such packer in case the shaft isbrass or bronze j acketed, as is often the case. A packer made of hardmendaci.

babbitt is recom- When I refer in specification and claims ingengagement with the casing, a rigid and shaft with liquid from thedseharge of the ubstantially incompressible c hndrical packpump. I I ingring including a. longitu inally disposed Ix'1wtness thai: I. 'claim thefora mg -I I drainage channel within said box, said ring have hereuntosubseribed my nome 1; 13th I 5 beng brought to a. substantiallynon-leaking day of J une, 1927. fiton the shaft and having un accuratelyma- WILLIAM J. MAORTHUR. chined radially curved end face resting innon-lea-king en agement against a. simi1 arly formed inner ace on saidgland the latter 10 having a channel in commumcation with the 'I channelof said ring, means far draining the channel in said gland and pivotallydisposedmeans carried by said box extending throu h said gland forholding said ring in seal tig t engagement therewith. 8

2. A packing assembl for a. moving cylin- 1rical pump part, in comination with a pump casing adapted to retain fluids under ressure, saidpart moving through a wall o said Casin sad assembly comprising: a,cylindrica box attached to and communicating V with the interim of saidcasin and surrounding said moving )art; a packmg element disosed aboutsai moving part within said 25 0x, said element being in the form of a.unitary, rigid and substantally-incompressible metallic sleeve slidablyand non-leakably fitting around said moving part and having a lonitndnally dis osed dranage channel, 30 sai sleeve bemg o such outerdiameter as to be free to move laterally within said bdx;the f ou'terend of said sleeve being faced flat; a closure for the outer end of'said box, theinner face of said closure, around said moving I 35 art,being arcuately curved; a metallic ring surroundn said moving artbetween the outer end o? said sleeve an thenner face 0f snid closure theinner face of said ring beng faced flat or non-leaking slidable'engixge- I 40 men with the flatouter end of said sleeve and the outerface of said rin bein fitted to the curvature of said n ner ace o saidclosure for non-leaking, swivlling engagement therewith, sad ring havinga. longitudinaly I 5 disp0sed drainage channel; means for hol '110 ingsad sleeve, said ring and said closure in mutual engagement end meanscommuflicati ng with said channels' and carried by said gland fordraining surface leakage on said I 5o shaft to the atmosphere. I I 1163. A packin 'rin adapted to be used on a. rotating impe er s aft of apump, com ris in'g: a sleeve adapted to fit the said s aft closly, aplurality of substantially cylinv drical channels in 'said sleeve, acoil spring in 120 each channel of a length suitable fon ereatmgcompression when the length of the springs I is limited to the length ofthe channels; c lindrical pins substantially of'the length 0 thechannels carried within each of said coil I sgrings, a. floatin rincarried upon the said s aft at each en of t e said sleeve, a gla'nd uponthe pump side of said sleeve beyond the I floating r1ng on-said side,and meansfor su plying the space 'between the sleeve and. t 0

